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Thin cirrus clouds - Seasonal distribution over oceans deduced from Nimbus-4 IRISSpectral differences in the extinction of the 10.8- and 12.6-micron bands of the IR window region, due to optically thin clouds, were found in the measurements made by both an airborne broadband IR radiometer and the IR interferometer spectrometer (IRIS) aboard the Nimbus-4 satellite; the extinction at 12.6 microns was significantly larger than that at 10.8 microns; both water and ice particles in the clouds can account for such spectral difference in extinction. Multiple scattering radiative transfer calculations of IRIS data revealed this spectral feature about 100 to 20 km away from the high-altitude cold clouds; it is assumed that this feature is related to the spreading of cirrus clouds. Based on this assumption, mean seasonal maps of the distribution of thin cirrus clouds over the oceans were deduced from the IRIS data. The maps show that such clouds are often present over the convectively active areas, such as ITCZ, SPCZ, and the Bay of Bengal during the summer monsoon.
Document ID
19880053827
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Prabhakara, C.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Fraser, R. S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Dalu, G.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wu, Man-Li C.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Curran, R. J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 13, 2013
Publication Date
April 1, 1988
Publication Information
Publication: Journal of Applied Meteorology
Volume: 27
ISSN: 0894-8763
Subject Category
Meteorology And Climatology
Accession Number
88A41054
Distribution Limits
Public
Copyright
Other

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